Flow Device Pioneers
While working in the 1990's for the Penobscot Indian Nation in Maine, Skip Lisle invented the first effective fence system to protect road culverts from beaver damming. He called his trapezoidal shaped culvert fence a Beaver Deceiver™. He shared this very effective flow device concept with others at workshops and in the scientific literature.
The trapezoidal shaped culvert fence installation demonstrated in our instructional DVD is largely based on Mr. Lisle's pioneering work. He also has contributed to the evolution of beaver dam pipe technology.
On a personal note, I remain tremendously grateful for Skip's foresight and inventiveness. I am indebted to the assistance Skip gave me in my early years, and enjoyed our collaborations. He continues to do this work and inspire others.
In May 1999 I met Michel LeClair at a Beaver Conference sponsored by Beaver, Wetlands, and Wildlife. That summer Michel was gracious enough to show my wife Ruth and I over 100 flow device sites in Gatineau Park, Ontario where he had installed his own innovative pond leveler pipes and culvert protective fences.
His impressive body of work, pioneering pond leveler pipe design, and invaluable lessons, inspires us to this day. The Flexible Pond Leveler™ that you see demonstrated in our instructional DVD was based primarily on his innovative pond leveler design.
Clemson University Researchers
In 1994 several Clemson University Cooperative Extension Service researchers (Dr. Gene W. Wood, Mr. Larry A. Woodward, and Dr. Greg Yarrow) published a landmark paper of the first beaver dam pipe system with a high success rate, called the Clemson Pond Leveler (PDF).
They scientifically proved that this novel PVC pipe system could prevent beavers from detecting the flow of water into a pipe and prevented them from blocking it. This discovery was a crucial step in the development of other more efficient beaver dam pipe designs, including the Flexible Pond Leveler™ demonstrated in our instructional DVD.